Sahih Muslim 2236
Sahih Muslim · Book 39: The Book of Greetings · Killing Snakes Etc.
Abu Sa'id Khudri reported Allah's Messenger having said:
وَحَدَّثَنَا زُهَيْرُ بْنُ حَرْبٍ ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ ، عَنِ ابْنِ عَجْلاَنَ ، حَدَّثَنِي صَيْفِيٌّ ، عَنْ أَبِي السَّائِبِ ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ ، قَالَ سَمِعْتُهُ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " إِنَّ بِالْمَدِينَةِ نَفَرًا مِنَ الْجِنِّ قَدْ أَسْلَمُوا فَمَنْ رَأَى شَيْئًا مِنْ هَذِهِ الْعَوَامِرِ فَلْيُؤْذِنْهُ ثَلاَثًا فَإِنْ بَدَا لَهُ بَعْدُ فَلْيَقْتُلْهُ فَإِنَّهُ شَيْطَانٌ " .
There is a group of jinns in Medina who accepted Islam, so he who would see anything from these occupants should warn him three times; and if he appears after that, he should kill him for he is a satan.